Reply to requests only after the changes
have been committed to stable storage. (Default)

async

This option allows the NFS server to violate the NFS protocol
and reply to requests before any changes made by that request have been committed to stable storage.

secure

This option requires that requests originate
on an Internet port less than IPPORT_RESERVED (1024). (Default)

insecure

This option accepts all ports.

wdelay

Delay committing a write request to disc slightly
if it suspects that another related write request may be in progress or may arrive soon. (Default)

no_wdelay

This option has no effect if async is also set.
The NFS server will normally delay committing a write request to disc slightly if it suspects that
another related write request may be in progress or may arrive soon.
This allows multiple write requests to be committed to disc with the one operation which
can improve performance. If an NFS server received mainly small unrelated requests,
this behaviour could actually reduce performance, so no_wdelay is available to turn it off.

subtree_check

This option enables subtree checking. (Default)

no_subtree_check

This option disables subtree checking,
which has mild security implications, but can improve reliability in some circumstances.

root_squash

Map requests from uid/gid 0 to the anonymous uid/gid.
Note that this does not apply to any other uids or gids that might be equally sensitive, such as user bin or group staff.

no_root_squash

Turn off root squashing. This option is mainly useful for
disk-less clients.

all_squash

Map all uids and gids to the anonymous user.
Useful for NFS exported public FTP directories, news spool directories, etc.

no_all_squash

Turn off all squashing. (Default)

anonuid=UID

These options explicitly set the uid and gid of the
anonymous account. This option is primarily useful for PC/NFS clients, where you might want all requests appear to be from one user.
As an example, consider the export entry for /home/joe in the example section below, which maps all requests to uid 150.